Groyne-heads as potential summer habitats for juvenile rheophilic fishes in the Lower Oder, Germany
Groyne-heads as potential summer habitats for juvenile rheophilic fishes in the Lower Oder, Germany
复制标题
德国下奥得河的 Groyne-heads 是嗜流性鱼类幼鱼的潜在夏季栖息地
DOI：
10.1016/s0075-9511(01)80043-8
复制
发表时间：
2001
期刊：
影响因子：
1.7
通讯作者：
C. Wolter
中科院分区：
文献类型：
--
作者：
A. Bischoff;C. Wolter
本研究的目的是验证人工结构的假设，即河槽的上游末端或河槽头，作为年轻的嗜流鱼的潜在栖息地。调查于1998年夏天在德国东部“下奥得谷”波兰-德国国家公园的奥得河上进行。采用电钓点丰度取样法在石坝头捕获鱼类，并与另外7个中生境（可通航的运河边、沙质河岸、抛石、深石坝、沙质石坝、连通的回水、圩田水体）用相同方法采集的标本进行比较。在浅坡、沙质海岸中生境中，0+嗜流石泥鳅（Barbatula Barbatula， L.）和burbot Lota Lota （L.）以石鳅为主，而0+嗜流鲤在浅坡、沙质海岸中生境中更为丰富。在调查的所有地点中，1+幼鱼在石头鱼上最丰富，其中嗜流型占总渔获量的很大比例。从我们的研究结果中我们得出结论，在夏季，石头鱼是0+和1+幼鱼的重要栖息地，但由于流量的变化，它的使用受到随机可用性的限制。
The present study aims to test the hypothesis that artificial structures, the riverward ends of groynes or groyne-heads, function as potential habitats for young rheophilic fish. The investigation was undertaken in summer 1998 on the River Oder, in the Polish-German National Park ‘Lower Oder Valley’, eastern Germany. Fish were caught on groyne-heads using point abundance sampling by electrofishing and compared with specimens collected by the same method in seven additional mesohabitats (navigable side-canal, sandy river bank, riprap, deep groyne, sandy groyne, connected backwater, polder waterbody). Groyne-heads were inhabited by bottom-oriented 0+ rheophilic stone loach Barbatula barbatula (L.) and burbot Lota lota (L.), whereas 0+ rheophilic cyprinid fish were more abundant in shallow-sloped, sandy shoreline mesohabitats. Of all sites investigated, 1+ juveniles were most abundant on groyne-heads, in which the rheophilic group formed a large proportion of the total catch. From our results we conclude that groyne-heads constitute an important habitat for both 0+ and 1+ juvenile rheophilic fish during summer-time, but that its use is limited by the stochastic availability due to varying discharges.